The difference between Crack up and Fall apart
When used as verbs, crack up means to laugh heartily, whereas fall apart means to disintegrate.
check bellow for the other definitions of Crack up and Fall apart
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Crack up as a verb (idiomatic, intransitive):
To laugh heartily.
Examples:
"It was hilarious. We were cracking up the whole time."
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Crack up as a verb (idiomatic, transitive):
To cause to laugh heartily.
Examples:
"The joke about the nuns in the bath cracked me up."
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Crack up as a verb (intransitive, idiomatic):
To become insane; to suffer a mental breakdown.
Examples:
"She got through the war, but cracked up when her sister died."
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Crack up as a verb (transitive, informal, usually passive, usually negative):
To cry up; to extol.
Examples:
"The job just can't be all that she 's cracked it up to be."
"It is not necessarily the great thing that the proponents are cracking it up to be."
"This new computer system is not what it was cracked up to be."
"It not nearly as good as it has been cracked up to be."
"I wonder whether it could be all it is being cracked up to be."
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Crack up as a verb (of an aircraft or automobile):
To crash.
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Fall apart as a verb (intransitive):
To disintegrate.
Examples:
"My old briefcase is falling apart. I'll have to buy a new one."
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Fall apart as a verb (idiomatic):
To be emotionally in crisis.
Examples:
"As a result of being addicted to heroin, she was falling apart."